Syzygy occurs when the moon (or a planet) is in opposition or conjuction with the Earth and Sun; the three bodies are positioned in a straight line. At syzygy, the moon (or planet) is seen as new or full (from Earth).

Occurs twice a month, when the Sun and the Moon are in conjunction (lined up on the same side of Earth at the new Moon) and when they are in opposition (on opposite sides of Earth at the full Moon, though usually not so directly in line as to produce an eclipse). In either case, the gravitational effects of the Sun and the Moon reinforce each other, and tidal range is increased.

"Syzygy" is the thirteenth episode of the third season of The X-Files. Agents Mulder and Scully visit a small town to investigate a series of bizarre deaths, mainly among high school teenagers. Evidence points to a Satanic cult.

The Syzygy software project is designed to run a wide range of VR applications on a PC cluster with equal or greater performance than an SGI Onyx, the traditional platform for high-end VR. It includes tools needed for efficiently managing and developing cluster applications, and enables users to run cluster applications over machines with different underlying architectures.